Is this Multi Home Deal Solid?

[Jonathan West]

All: I have a landlord in my area that is interested in selling their properties.  I have the option to purchase them individually or all together.  They are D class homes but have long rental history.  They all need some work done to them, but I don't see anything significant at the moment.  I believe that I can raise the rents by $50 per unit after adding a little TLC to them.  This seems to be a good purchase overall, but I am still learning how to analyze deals. 

 Please let me know you thoughts.  Is this a good overall deal or should I only purchase the best ones?  Seller is open to seller financing.  

Address	Price	Monthly Rent	Annual Taxes	Percentage Rule:
Property #1 (7 Units total; Combined rent is $1970)	$90,000	$1,970	$2,200	0.021888889
Property #2	$25,000	$240	$650	0.0096
Property #3	$35,000	$325	$732	0.009285714
Property #4	$28,000	$400	$725	0.014285714
Property #5	$38,000	$400	$805	0.010526316
Property #6	$45,000	$400	$877	0.008888889
Property #7	$30,000	$375	$777	0.0125
Property #8 (needs work and not rented, but going monthly rate is $400)	$15,000	$0	$344	0